Heat interchanger



April 2, 1929. F. H. WILLCOX ET AL 1,707,777

HEAT INTERCHANGER Filed April 11, 1927 r kH w} NW.

Patented Apr. 2, 1929.

UNITED STATES 1,107,717 PATENT OFFICE. I i

FREDERICK H. WILLCOX AND JOHN C. HAYES, JR., OF CHICAGO, ILLINOIS, ASSIGNOBS TO FREYN ENGINEERING COMPANY, OF CHICAGO, ILLHTOIS, A CORPORATION OF MAINE.

HEAT IN TERCHANGER.

Application filed April 11, 1927. Serial No. 182,760.

Further objects will appear as the description proceeds.

I Figure 1 of the drawing illustrates a system embodying invention; and v Figure 2 shows a detail of construction.

The numeral 1 indicates a heat interchanger to which communication is had through the conduit 2 adapted to conduct hot waste gas from hot blast stoves or other'hot gas emitting devices. The hot gas from the conduit 2, after passing through the heat interchanger,

emerges through the conduit 3 into the stack 4. A damper 5 is provided forcontrolhng the flow of gases through said conduit 3. Leading to the heat interchanger 1 is the pipe, 6 adapted to conduct relatively cold gas from a gas washer, and the numeral 7 indicates a pipe for conducting dry hot gas to burners, which may be the burners of hot blast stoves.

The heat interchanger 1, as shown in the drawing, comprises an elongated chamber 8 having the upper wall 9 and the lower wall 10. The two side walls of the heat interchanger provide the side walls of said chamber 8. Said chamber 8 communicates with the inlet conduit 2 and with the outlet conduit 3. Secured in the top and bottom walls 9 and 10 of the chamber 8 are a plurality of spaced, vertically disposed flues 11-11, which open into the space 12 above the wall 9 and into the space 13 below the bottom wall 10. As will be noted from the drawing, the inlet pipe 6 for cold gas has communication with one end of the heat interchanger 1, whereas the exit pipe from the dry hot gas leads from the opposite end of-said heat interchanger 1. The passageway 13 has adecreasing cross sectional area from the inlet end thereof to the exit end thereof, while the passageway 12 has an increasing cross sectional area from the inlet end thereof to the outletend thereof. It will be clear without detailed explanation that the principles of the present .tively great number of small diameter tubes.

hot flue gases passing through the chamber 8 in proximity to the tubes 1111 will communicate heat to the washed gas passing upwardly through the interior of said flues 1111, conditioning said washed gas for delivery to burners.

Positioned above each of the flues 11-41 is a jet 14 for delivering a cleansing medium to the inner walls of said flues. Said jets are supplied from the pipes 15, which also serve to support said jets. Said pipes 15extend through the side wall of the heat interchanger and are connected to the water supply line 16. Connected to the water supply line 16 is the steam supply line 17. Said water supply line 16 and steam supply line 17 are also connected to the upper portion of the pas- V sageway13 at the bottom of the heat interchanger, whereby the heat interchanger may be completely flushed. The lower extremity of the passageway or chamber 13'is provided with the hopper 18, which is provided with the pipe 19 controlled by the valve 20.

Each of the pipes 15 may be provided with a valve 21, whereby the flues associated with each particular pipe may be flushed without interfering with the operation of the other flues. By reason of this construction a predetermined relatively small number of the total number of flues may be flushed without taking the heat interchanger outof service. It will be understood, of course, that the number of jets responsive to any one valve may be chosen as desired.

The present invention contemplates a rela- By reason of the vertical arrangement of the tubes and by reason of the convenient means for flushing said tubes, a small diameter of the tube is rendered possible, whereby the area of heat transfer surface may be increased over prior practice in an installation occupying a predetermined space. By reason of the construction illustrated, the settling chamber or passageway 13 is provided for the rose tion of sludge below the bottom wall or tu sheet 10. By reason of the slanting position of the bottom wall of the chamber or passageway 13, the flushin water will interfere very little with the tu es which are not being flushed, the water, after having flushed out any tubes, being out of the path of the incoming gas. As will be noted from the drawing, the inlet pipe 6 is located at a point materially above the hopper 18, the advantage 110 'lected in and above said hopper 18.

being that incoming gases through the pipe 6 will be out of the path of sludge or water col- By reasonof the tapering arrangement of the passla'geways or chambers 12 and 13, the result is achieved that a substantially uniform fiow may be used instead of gas.

Moreover, though water ant steam have been referred to as the cleaning media, other media may bechose'n if preferred.

Though a preferred embodiment has been described in detail, the disclosure should be considered in an illustrative way rather than in av limiting sense. Many modifications will occur to those skilled in the art. It is intended to cover all such modifications that fall within the scope of the appended claims. What is claimed is :1. A heat interchanger comprising a gas conducting chamber,- fines vertically disposed within said chamber, a gas conduit communicating with said fines at the lower endsthereof and a gas conduit communicating with said fiucs at the upper ends thereof, said first mentioned conduit having an inlet. at one end ofsaid chamber and convergingin cross sectional area toward the other end of said chamber, said second mentioned conduit having an outlet adjacent to the; other end of said chamber and converging in cross sectional area from said other end toward said first mentioned end of said chamber, and flushing jets disposed within said second mentioned conduit and communicating with said fines for fiushing'said fiues.

2. A heat interchanger comprising a conducting chamber, fiues vertically disposed within said chamber, a gas conduit communicating with said fines the lower ends thereof and a gas conduit communicating with said fines at the upper ends thereof, said first mentioned conduit having an inlet at one end of said chamber and converging in cross sectional area toward the other end of-said chamber, said second mentioned conduit having an outlet adjacent to :the other end of said chamber and converg- 'ing in cross sectional area from said other end toward'said first mentioned end of said chamber, and. flushing jets disposed within said second mentioned conduit and commuiinicating with said fines for flushing said 'fiues, groups of said jets being controlled. by andividual valves whereby said groups may be flushed Without interfering with the tether- 0f said fines.

3. A heat interchanger comp'risinga gas conduct ng chamber, fiues vertically CllS- posed within said chamber, a .gas conduit. communicating with said fines at the lower ends thereof and a gas conduit communicating with said fiuesat the upper ends thereof, said first mentioned conduit having an inlet at one end of said chamber and converging in cross'sectional area toward the other end of said chamber, said second mentioned conduithavingan outlet adjacent to the other. end of said chamberand converging in cross sectional-area from said other end toward said first mentioned end of said chamber, and flushing jets disposed within said second mentioned conduit and communicating with said fiues for flushing said fines, the inlet to 'sa-id first mentioned conduit being disposed materially above the out let of said first mentioned conduit.

l. A heat interchanger comprising a gas conducting chamber, fines vertically disposed within said chamber, a gas conduit communicating with said fiues at the lower endsthereotand a gas conduit communicating with s: id fiues at the upper ends thereof,

said first mentioned conduit having an inlet, said second mentioned conduithaving an outlet and flushing jets disposed withinsaid second mentioned conduit and communicat ing with said fines for flushing said fines.

5. A heat inter-changercomprising a gas conducting chamber, fines vertically disposed within said chamber, a gas conduit communicating with said fi'ues at theilower ends thereof and a gas conduit communicati ngwith said fiuesv at the upper ends thereof, saidfirst mentioned conduit having an inlet, said second mentioned conduit having an outlet and flushing jets disposed within said second mentioned conduit and communicating with said fines for flushing said fines, groups of said jets being controlled by individual valves whereby said groups maybe flushed without interfering with the other of said fiues.

6. A heat interchanger comprising a gas conducting chamber, fi-ues vertically disposed within said chamber, a gas conduit communicating with said fiues at the lower ends thereof anda gas conduit communicating with said 'fiues at the upper ends thereof, said first mentioned condui'thaving an inlet, said second mentioned conduit having an outlet, and flushing jets disposed within said second mentioned conduit and communicating with said lines for flushing said fines, the inlet to said-first mentioned conduit being disposed materially above the outlet of said first. mentioned conduit.

Signed at Chicagmlllinois, this 5 day of April, 1927. r

V FREDERICK H. WILLCOX. "JOHN G. HAYES, JR. 

